Articles | Volume 15, issue 1
Nonlin. Processes Geophys., 15, 53–59, 2008
https://doi.org/10.5194/npg-15-53-2008
Nonlin. Processes Geophys., 15, 53–59, 2008
https://doi.org/10.5194/npg-15-53-2008

  05 Feb 2008

05 Feb 2008

The influence of solar wind turbulence on geomagnetic activity

D. Jankovičovà1, Z. Vörös1,2, and J. Šimkanin3 D. Jankovičovà et al.
  • 1Institute of Atmospheric Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
  • 2Space Research Institute, Austrian Academy of Science, Graz, Austria
  • 3Geophysical Institute, Academy of Sciences of the Czech Republic, Prague, Czech Republic

Abstract. The importance of space weather and its forecasting is growing as interest in studying geoeffective processes in the Sun – solar wind – magnetosphere – ionosphere coupled system is increasing. In this paper higher order statistical moments of interplanetary magnetic field and geomagnetic SYM-H index fluctuations are compared. The proper description of fluctuations in the solar wind can elucidate important aspects of the geoeffectivity of upstream turbulence and contribute to our understanding of space weather. Our results indicate that quasi-stationary intervals during both quiet and stormy periods have to be investigated in order to find correlations between upstream and geomagnetic conditions. We found that the fourth statistical moment (kurtosis), which was not considered in previous studies, appears to be a new geoeffective parameter. Intermittency of the magnetic turbulence in the solar wind can influence the efficiency of the solar wind – magnetosphere coupling through affecting magnetic reconnection at the Earth's magnetopause.